List of top Physics Questions asked in MHT CET

Three identical polaroids \(P_1, P_2\) and \(P_3\) are placed one after another. The pass axis of \(P_2\) and \(P_3\) are inclined at an angle of \(60^\circ\) and \(90^\circ\) with respect to axis of \(P_1\). The source has an intensity \(256 \text{ W/m}^2\). The intensity of light at point ‘O’ is

The ratio of the wavelength of the last line of Paschen series to that of Balmer series is

When a big drop of water is formed from ' \(n\) ' small drops of water, the energy loss is ' \(3E\) ' where ' \(E\) ' is the energy of the bigger drop. The radius of the bigger drop is ' R ' and that of smaller drop is ' \(r\) ' then the value of ' \(n\) ' is

In a Fraunhoffer diffraction, light of wavelength '\(\lambda\)' is incident on slit of width ' d '. The diffraction pattern is observed on a screen placed at a distance ' D '. The linear width of central maximum is equal to two times the width of the slit, then 'D' has value

An alternating voltage \(E = 100\sqrt{2} \sin(50t)\) is connected to a \(2\mu\text{F}\) capacitor through an a.c. ammeter. The ammeter reading will be

When the heat is given to a gas in an Isothermal process, then there will be

There is head-on elastic collision between the two particles moving in the same direction with speeds \(5\text{ m/s}\) and \(3\text{ m/s}\) respectively. After collision, the velocity of the first particle becomes \(4\text{ m/s}\) in the same direction. The velocity of the second particle should be

Two long straight wires A and B carrying equal current 'I' were kept parallel to each other at distance ' d ' apart. Magnitude of magnetic force experienced by length \(L\) of wire A is ' \(F\) '. If the distance between the wires is made half and currents are doubled, force \(F_2\) on length \(L\) of wire A will be

For ideal non-rigid diatomic gas, the value of \(\frac{R}{C_V}\) is nearly \((\gamma = \frac{C_P}{C_V} = \frac{9}{7})\)

Light of wavelength \(\lambda\) strikes a photoelectric surface and electrons are ejected with energy \(E\). If \(E\) is to be increased to twice the original value, the wavelength changes to \(\lambda_1\)

One end of a capillary tube is dipped in water, the rise of water column is '\(h\)'. The upward force of 98 dyne due to surface tension is balanced by the force due to the weight of the water column. The inner circumference of the capillary is ( surface tension of water \(= 7 \times 10^{-2}\text{Nm}^{-1}\) )

In Young's double slit interference experiment, using two coherent sources of different amplitudes, the intensity ratio between bright to dark fringes is \(5 : 1\). The value of the ratio of resultant amplitudes of bright fringe to dark fringe is

When a ceiling fan is switched off, its angular velocity falls to \((\frac{1}{3})^{\text{rd}\) while it makes 24 rotations. How many more rotations will it make before coming to rest?

Two charges \(q_1 = +6q\) and \(q_2 = -3q\) placed as shown in figure. A proton is placed on x-axis away from \(q_2\). To remain proton in equilibrium, the distance between \(q_1\) and proton is

The molar specific heat of an ideal gas at constant pressure and constant volume is '\(C_P\)' and '\(C_V\)' respectively. If '\(R\)' is a universal gas constant and the ratio of '\(C_P\)' to '\(C_V\)' is \(\gamma\), then '\(C_P\)' is equal to

A thin uniform rod of mass \(m\) and length \(L\) is pivoted at one end so that it can rotate in a vertical plane. The free end is held vertically above pivot and then released. The angular acceleration of the rod when it makes an angle \(\theta\) with the vertical is (consider negligible friction at the pivot) (\(g =\) acceleration due to gravity)

A string of mass \(0.1\text{ kg m}^{-1}\) has length \(0.9\text{ m}\). It is fixed at both ends and stretched such that it has a tension of \(40\text{ N}\). The string vibrates in three segments with amplitude \(0.3\text{ cm}\). The amplitude (maximum) of the particle velocity is (in \(\text{m/s}\))

For a common emitter transistor, if \(\frac{I_C}{I_E} = 0.95\), then the current gain is

In the depletion layer of reverse biased p-n junction, the

Black sphere of radius \(\text{R}\) radiates power \(\text{P}\) at certain temperature \(T\). If the temperature is doubled, the radius gets doubled. Now the power radiated would be

The ratio of angular momentum \(L\) of an electron to the magnetic dipole moment \(\vec{\text{m}}_{\text{orb}}\) is ( '\(m\)' is mass of electron, '\(e\)' is charge on electron)

If '\(\lambda_1\)' and '\(\lambda_2\)' are the wavelengths of the first member of the Balmer and Paschen series, in hydrogen atom respectively, then the ratio of respective frequencies, \(f_1/f_2\) , is

For a thin prism, \(\delta_1\) is the angle of deviation produced, when prism is placed in air. When the prism is immersed in water, the angle of deviation produced is \(\delta_2\). Given \({}_{\text{a}}\mu_{\text{g}} = \frac{3}{2}\) and \({}_{\text{a}}\mu_{\text{w}} = \frac{4}{3}\) . The ratio \(\delta_2 : \delta_1\) is

When three inductors of same inductance '\(L\)' are connected in series and '\(I\)' is the current passing through the circuit. The energy stored in the circuit is

A series LCR circuit is connected to an a.c. source of \(230\text{ V}, 50\text{ Hz}\). The circuit contains resistance of \(80\Omega\), inductive reactance \(70\Omega\) and capacitive reactance \(130\Omega\). The power factor of the circuit is \(x\). The value of \(x\) is